There is a known error with Google Places where when you use the bulk upload listing feature, your business categories may go bonkers.

A parking lot company said they are “having an issue” with their Google Maps listings. He said Google is saying there “is a problem with my categories, but when I update them, the error is still there.”

Jade Wang from Google responded saying it is a known issue:

Working on it for how long? Is it a new issue or just a lingering issue on the back burner? As you know, Google Places is polluted with bugs.

Forum discussion at Google Business Help.